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Diodes Incorporated.

Very low cathode current 2.5V shunt regulator with industrial temperature range and 36V max input voltage

Microsemi Corporation

Precision programmable References

ON Semiconductor

Programmable Precision References

GUANGDONG HOTTECH INDUSTRIAL CO.,LTD.

Plastic-Encapsulate Adjustable Reference Source

KEC

BIPOLAR LINEAR INTEGRATED CIRCUIT

Analog Intergrations

Adjustable Precision Shunt Regulators

NXP Semiconductors.

Adjustable precision shunt regulator

Foshan Blue Rocket Electronics Co.,Ltd.

Precision adjustable shunt regulator in a TO-92 Plastic Package 

Fairchild Semiconductor

Programmable Shunt Regulator

Compact Technology Corp.

Adjustable Precision Shunt Regulator